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scsi: simplify scsi_bios_ptable

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Use read_mapping_page and kmemdup instead of the odd read_dev_sector and
put_dev_sector helpers from the partitioning code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-03-24 08:25:15 +01:00 committed by Jens Axboe
parent f17c21c1ec
commit e63105df8f
1 changed files with 11 additions and 13 deletions
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24
drivers/scsi/scsicam.c
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@ -35,19 +35,17 @@ static int setsize(unsigned long capacity, unsigned int *cyls, unsigned int *hds
*/
unsigned char *scsi_bios_ptable(struct block_device *dev)
{
unsigned char *res = kmalloc(66, GFP_KERNEL);
if (res) {
struct block_device *bdev = dev->bd_contains;
Sector sect;
void *data = read_dev_sector(bdev, 0, &sect);
if (data) {
memcpy(res, data + 0x1be, 66);
put_dev_sector(sect);
} else {
kfree(res);
res = NULL;
}
}
struct address_space *mapping = dev->bd_contains->bd_inode->i_mapping;
unsigned char *res = NULL;
struct page *page;
page = read_mapping_page(mapping, 0, NULL);
if (IS_ERR(page))
return NULL;
if (!PageError(page))
res = kmemdup(page_address(page) + 0x1be, 66, GFP_KERNEL);
put_page(page);
return res;
}
EXPORT_SYMBOL(scsi_bios_ptable);