From 315cb0ad124575e75da2d0e0a95990587fc23485 Mon Sep 17 00:00:00 2001 From: James Smart Date: Thu, 7 Aug 2008 20:49:30 -0400 Subject: [SCSI] scsi_host_lookup: error returns and NULL pointers This patch cleans up the behavior of scsi_host_lookup(). The original implementation attempted to use the dual role of either returning a pointer value, or a negative error code. User's needed to use IS_ERR() to check the result. Additionally, the IS_ERR() macro never checks for when a NULL pointer was returned, so a NULL pointer actually passes with a success case. Note: scsi_host_get(), used by scsi_host_lookup(), can return a NULL pointer. Talk about a mudhole for the unitiated to step into.... This patch converts scsi_host_lookup() to return either NULL or a valid pointer. The consumers were updated for the change. Signed-off-by: James Smart Signed-off-by: James Bottomley --- drivers/scsi/scsi_tgt_lib.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/scsi/scsi_tgt_lib.c') diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c index 257e097c39a..f26299dfc5d 100644 --- a/drivers/scsi/scsi_tgt_lib.c +++ b/drivers/scsi/scsi_tgt_lib.c @@ -460,7 +460,7 @@ int scsi_tgt_kspace_exec(int host_no, u64 itn_id, int result, u64 tag, /* TODO: replace with a O(1) alg */ shost = scsi_host_lookup(host_no); - if (IS_ERR(shost)) { + if (!shost) { printk(KERN_ERR "Could not find host no %d\n", host_no); return -EINVAL; } @@ -550,7 +550,7 @@ int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 itn_id, u64 mid, int result) dprintk("%d %d %llx\n", host_no, result, (unsigned long long) mid); shost = scsi_host_lookup(host_no); - if (IS_ERR(shost)) { + if (!shost) { printk(KERN_ERR "Could not find host no %d\n", host_no); return err; } @@ -603,7 +603,7 @@ int scsi_tgt_kspace_it_nexus_rsp(int host_no, u64 itn_id, int result) dprintk("%d %d%llx\n", host_no, result, (unsigned long long)itn_id); shost = scsi_host_lookup(host_no); - if (IS_ERR(shost)) { + if (!shost) { printk(KERN_ERR "Could not find host no %d\n", host_no); return err; } -- cgit v1.2.3