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diff --git a/src/linux_sysfs.c b/src/linux_sysfs.c
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index 8c3cf67..2ea78c1 100644
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--- a/src/linux_sysfs.c
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+++ b/src/linux_sysfs.c
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@@ -227,6 +227,7 @@ pci_device_linux_sysfs_probe( struct pci_device * dev )
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pciaddr_t bytes;
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unsigned i;
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int err;
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+ struct stat st;
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err = pci_device_linux_sysfs_read( dev, config, 0, 256, & bytes );
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@@ -293,11 +294,28 @@ pci_device_linux_sysfs_probe( struct pci_device * dev )
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flags = strtoull( next, & next, 16 );
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if ( low_addr != 0 ) {
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priv->rom_base = low_addr;
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- dev->rom_size = (high_addr - low_addr) + 1;
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}
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}
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}
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+ snprintf( name, 255, "%s/%04x:%02x:%02x.%1u/rom",
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+ SYS_BUS_PCI,
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+ dev->domain,
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+ dev->bus,
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+ dev->dev,
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+ dev->func );
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+
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+ fd = open( name, O_RDWR );
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+ if ( fd == -1 ) {
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+ dev->rom_size = 0x10000;
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+ } else if ( fstat( fd, & st ) == -1 ) {
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+ close( fd );
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+ dev->rom_size = 0x10000;
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+ } else {
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+ close( fd );
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+ dev->rom_size = st.st_size == 0 ? 0x10000 : st.st_size;
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+ }
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+
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return err;
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}
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@@ -309,7 +327,6 @@ pci_device_linux_sysfs_read_rom( struct pci_device * dev, void * buffer )
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int fd;
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struct stat st;
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int err = 0;
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- size_t rom_size;
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size_t total_bytes;
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@@ -334,10 +351,6 @@ pci_device_linux_sysfs_read_rom( struct pci_device * dev, void * buffer )
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return errno;
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}
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- rom_size = st.st_size;
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- if ( rom_size == 0 )
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- rom_size = 0x10000;
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-
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/* This is a quirky thing on Linux. Even though the ROM and the file
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* for the ROM in sysfs are read-only, the string "1" must be written to
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* the file to enable the ROM. After the data has been read, "0" must be
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@@ -346,9 +359,9 @@ pci_device_linux_sysfs_read_rom( struct pci_device * dev, void * buffer )
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write( fd, "1", 1 );
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lseek( fd, 0, SEEK_SET );
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- for ( total_bytes = 0 ; total_bytes < rom_size ; /* empty */ ) {
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+ for ( total_bytes = 0 ; total_bytes < dev->rom_size ; /* empty */ ) {
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const int bytes = read( fd, (char *) buffer + total_bytes,
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- rom_size - total_bytes );
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+ dev->rom_size - total_bytes );
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if ( bytes == -1 ) {
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err = errno;
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break;
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