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| author | Arnd Bergmann <arnd@arndb.de> | 2015-10-07 15:11:04 +0200 |
|---|---|---|
| committer | James Bottomley <JBottomley@Odin.com> | 2015-11-09 17:10:24 -0800 |
| commit | 720ba808e9ca276919f566bbe2b4e09c79f25faa (patch) | |
| tree | ded0205bbdc7e55b5debaa10e4461e4a1ed1ea64 | |
| parent | e79504236548e4c909959ba444f87a12224555ac (diff) | |
| download | linux-720ba808e9ca276919f566bbe2b4e09c79f25faa.tar.gz linux-720ba808e9ca276919f566bbe2b4e09c79f25faa.tar.bz2 linux-720ba808e9ca276919f566bbe2b4e09c79f25faa.zip | |
bnx2fc: reduce stack usage in __bnx2fc_enable
When the bnx2fc driver was changed to read the npiv table from
nvram, the stack of the __bnx2fc_enable function gained an
additional 1028 byte structure that gcc rightfully warns about:
drivers/scsi/bnx2fc/bnx2fc_fcoe.c: In function '__bnx2fc_enable':
drivers/scsi/bnx2fc/bnx2fc_fcoe.c:2134:1: warning: the frame size of 1128 bytes is larger than 1024 bytes [-Wframe-larger-than=]
In order to avoid a possible kernel stack overflow and to get rid
of the warning, this changes the function to use a dynamic allocation
of the structure using kzalloc.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 2971ff67bd3 ("bnx2fc: Read npiv table from nvram and create vports.")
Acked-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
| -rw-r--r-- | drivers/scsi/bnx2fc/bnx2fc_fcoe.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c index b0bc5ffee903..29a1c03b558e 100644 --- a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c +++ b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c @@ -2091,7 +2091,7 @@ static int __bnx2fc_enable(struct fcoe_ctlr *ctlr) { struct bnx2fc_interface *interface = fcoe_ctlr_priv(ctlr); struct bnx2fc_hba *hba; - struct cnic_fc_npiv_tbl npiv_tbl; + struct cnic_fc_npiv_tbl *npiv_tbl; struct fc_lport *lport; if (interface->enabled == false) { @@ -2123,11 +2123,16 @@ static int __bnx2fc_enable(struct fcoe_ctlr *ctlr) if (!hba->cnic->get_fc_npiv_tbl) goto done; - memset(&npiv_tbl, 0, sizeof(npiv_tbl)); - if (hba->cnic->get_fc_npiv_tbl(hba->cnic, &npiv_tbl)) + npiv_tbl = kzalloc(sizeof(struct cnic_fc_npiv_tbl), GFP_KERNEL); + if (!npiv_tbl) goto done; - bnx2fc_npiv_create_vports(lport, &npiv_tbl); + if (hba->cnic->get_fc_npiv_tbl(hba->cnic, npiv_tbl)) + goto done_free; + + bnx2fc_npiv_create_vports(lport, npiv_tbl); +done_free: + kfree(npiv_tbl); done: return 0; } |