Make the MODE SENSE response buffer larger and allocate it from the heap. This patch prepares for adding support for the IO Advice Hints Grouping mode page. Suggested-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> Cc: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> Tested-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx> Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx> --- drivers/scsi/scsi_debug.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index cadd130d6b53..4181d0d81224 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -43,6 +43,7 @@ #include <linux/prefetch.h> #include <linux/debugfs.h> #include <linux/async.h> +#include <linux/cleanup.h> #include <net/checksum.h> @@ -2637,7 +2638,8 @@ static int resp_sas_sha_m_spg(unsigned char *p, int pcontrol) return sizeof(sas_sha_m_pg); } -#define SDEBUG_MAX_MSENSE_SZ 256 +/* PAGE_SIZE is more than necessary but provides room for future expansion. */ +#define SDEBUG_MAX_MSENSE_SZ PAGE_SIZE static int resp_mode_sense(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) @@ -2648,10 +2650,13 @@ static int resp_mode_sense(struct scsi_cmnd *scp, int target_dev_id; int target = scp->device->id; unsigned char *ap; - unsigned char arr[SDEBUG_MAX_MSENSE_SZ]; + unsigned char *arr __free(kfree); unsigned char *cmd = scp->cmnd; bool dbd, llbaa, msense_6, is_disk, is_zbc; + arr = kzalloc(SDEBUG_MAX_MSENSE_SZ, GFP_ATOMIC); + if (!arr) + return -ENOMEM; dbd = !!(cmd[1] & 0x8); /* disable block descriptors */ pcontrol = (cmd[2] & 0xc0) >> 6; pcode = cmd[2] & 0x3f;
