Blame SOURCES/0485-ieee1275-ofdisk-retry-on-open-failure.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Diego Domingos <diegodo@br.ibm.com>
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Date: Wed, 10 Mar 2021 14:17:52 -0500
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Subject: [PATCH] ieee1275/ofdisk: retry on open failure
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This patch aims to make grub more robust when booting from SAN/Multipath disks.
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If a path is failing intermittently so grub will retry the OPEN and READ the
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disk (grub_ieee1275_open and grub_ieee1275_read) until the total amount of times
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specified in MAX_RETRIES.
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Signed-off-by: Diego Domingos <diegodo@br.ibm.com>
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---
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 grub-core/disk/ieee1275/ofdisk.c | 25 ++++++++++++++++++++-----
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 include/grub/ieee1275/ofdisk.h   |  8 ++++++++
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 2 files changed, 28 insertions(+), 5 deletions(-)
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diff --git a/grub-core/disk/ieee1275/ofdisk.c b/grub-core/disk/ieee1275/ofdisk.c
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index f3a6ecd797f..98325ca982f 100644
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--- a/grub-core/disk/ieee1275/ofdisk.c
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+++ b/grub-core/disk/ieee1275/ofdisk.c
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@@ -225,7 +225,9 @@ dev_iterate (const struct grub_ieee1275_devalias *alias)
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       char *buf, *bufptr;
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       unsigned i;
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-      if (grub_ieee1275_open (alias->path, &ihandle))
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+
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+      RETRY_IEEE1275_OFDISK_OPEN(alias->path, &ihandle)
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+      if (! ihandle)
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 	return;
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       /* This method doesn't need memory allocation for the table. Open
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@@ -305,7 +307,9 @@ dev_iterate (const struct grub_ieee1275_devalias *alias)
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           return;
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         }
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-      if (grub_ieee1275_open (alias->path, &ihandle))
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+      RETRY_IEEE1275_OFDISK_OPEN(alias->path, &ihandle);
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+
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+      if (! ihandle)
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         {
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           grub_free (buf);
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           grub_free (table);
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@@ -495,7 +499,7 @@ grub_ofdisk_open (const char *name, grub_disk_t disk)
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     last_ihandle = 0;
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     last_devpath = NULL;
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-    grub_ieee1275_open (op->open_path, &last_ihandle);
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+    RETRY_IEEE1275_OFDISK_OPEN(op->open_path, &last_ihandle);
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     if (! last_ihandle)
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       return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't open device");
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     last_devpath = op->open_path;
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@@ -571,7 +575,7 @@ grub_ofdisk_prepare (grub_disk_t disk, grub_disk_addr_t sector)
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       last_ihandle = 0;
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       last_devpath = NULL;
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-      grub_ieee1275_open (disk->data, &last_ihandle);
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+      RETRY_IEEE1275_OFDISK_OPEN(disk->data, &last_ihandle);
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       if (! last_ihandle)
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 	return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "can't open device");
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       last_devpath = disk->data;      
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@@ -598,12 +602,23 @@ grub_ofdisk_read (grub_disk_t disk, grub_disk_addr_t sector,
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     return err;
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   grub_ieee1275_read (last_ihandle, buf, size  << disk->log_sector_size,
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 		      &actual);
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-  if (actual != (grub_ssize_t) (size  << disk->log_sector_size))
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+  int i = 0;
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+  while(actual != (grub_ssize_t) (size  << disk->log_sector_size)){
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+    if (i>MAX_RETRIES){
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     return grub_error (GRUB_ERR_READ_ERROR, N_("failure reading sector 0x%llx "
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 					       "from `%s'"),
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 		       (unsigned long long) sector,
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 		       disk->name);
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+    }
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+    last_devpath = NULL;
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+    err = grub_ofdisk_prepare (disk, sector);
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+    if (err)
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+      return err;
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+    grub_ieee1275_read (last_ihandle, buf, size  << disk->log_sector_size,
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+                      &actual);
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+    i++;
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+  }
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   return 0;
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 }
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diff --git a/include/grub/ieee1275/ofdisk.h b/include/grub/ieee1275/ofdisk.h
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index 2f69e3f191d..7d2d5409305 100644
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--- a/include/grub/ieee1275/ofdisk.h
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+++ b/include/grub/ieee1275/ofdisk.h
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@@ -22,4 +22,12 @@
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 extern void grub_ofdisk_init (void);
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 extern void grub_ofdisk_fini (void);
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+#define MAX_RETRIES 20
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+
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+
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+#define RETRY_IEEE1275_OFDISK_OPEN(device, last_ihandle) unsigned retry_i=0;for(retry_i=0; retry_i < MAX_RETRIES; retry_i++){ \
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+						if(!grub_ieee1275_open(device, last_ihandle)) \
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+						break; \
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+						grub_dprintf("ofdisk","Opening disk %s failed. Retrying...\n",device); }
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+
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 #endif /* ! GRUB_INIT_HEADER */