[PATCH v2 03/11] scsi: sd_zbc: Fix sd_zbc_check_zones() error checks

Damien Le Moal
2018-10-11T14:35:54Z

The 32 bits overflow check for the zone size value is already done
within sd_zbc_check_zones() with the test:

} else if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) {

so there is no need to check again for an out of range value in
sd_zbc_read_zones(). Simplify the code and fix sd_zbc_check_zones()
error return to -EFBIG instead of -ENODEV if the zone size is too large.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
drivers/scsi/sd_zbc.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index ca73c46931c0..44b64b4a922a 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -373,7 +373,7 @@ static int sd_zbc_check_zoned_characteristics(struct scsi_disk *sdkp,
* Returns the zone size in number of blocks upon success or an error code
* upon failure.
*/
-static s64 sd_zbc_check_zones(struct scsi_disk *sdkp)
+static s32 sd_zbc_check_zones(struct scsi_disk *sdkp)
{
u64 zone_blocks = 0;
sector_t max_lba, block = 0;
@@ -472,7 +472,7 @@ static s64 sd_zbc_check_zones(struct scsi_disk *sdkp)
if (sdkp->first_scan)
sd_printk(KERN_NOTICE, sdkp,
"Zone size too large\n");
- ret = -ENODEV;
+ ret = -EFBIG;
} else {
ret = zone_blocks;
}
@@ -668,8 +668,7 @@ static int sd_zbc_setup(struct scsi_disk *sdkp, u32 zone_blocks)

int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
{
- int64_t zone_blocks;
- int ret;
+ int ret, zone_blocks;

if (!sd_is_zoned(sdkp))
/*
@@ -688,12 +687,10 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
* an eventual last runt zone) that is a power of 2 are supported.
*/
zone_blocks = sd_zbc_check_zones(sdkp);
- ret = -EFBIG;
- if (zone_blocks != (u32)zone_blocks)
- goto err;
- ret = zone_blocks;
- if (ret < 0)
+ if (zone_blocks < 0) {
+ ret = zone_blocks;
goto err;
+ }

/* The drive satisfies the kernel restrictions: set it up */
ret = sd_zbc_setup(sdkp, zone_blocks);
--
2.17.1