Instead of strcpy'ing into a stack buffer, just let additional_notice
point to a string literal living in .rodata. This is better in a few
ways:
- Smaller .text - instead of gcc compiling the strcpys as a bunch of
immediate stores (effectively encoding the string literal in the
instruction stream), we only pay the price of storing the literal in
.rodata.
- Faster, because there's no string copying.
- Smaller stack usage (with my compiler, 72 bytes instead of 176 for
the sole caller, bnx2i_indicate_kcqe)
Moreover, it's currently possible for additional_notice[] to get used
uninitialized, so some random stack garbage would be passed to
printk() - in the worst case without any '\0' anywhere in those 64
bytes. That could be fixed by initializing additional_notice[0], but
the same is achieved here by initializing the new pointer variable to
"".
Also give the message pointer a similar treatment - there's no point
making temporary copies on the stack of those two strings.
Signed-off-by: Rasmus Villemoes
---
drivers/scsi/bnx2i/bnx2i_hwi.c | 85 --
1 file changed, 41 insertions(+), 44 deletions(-)
diff --git a/drivers/scsi/bnx2i/bnx2i_hwi.c b/drivers/scsi/bnx2i/bnx2i_hwi.c
index bad396e5c601..43e8a1dafec0 100644
--- a/drivers/scsi/bnx2i/bnx2i_hwi.c
+++ b/drivers/scsi/bnx2i/bnx2i_hwi.c
@@ -2206,10 +2206,8 @@ static void bnx2i_process_iscsi_error(struct bnx2i_hba
*hba,
{
struct bnx2i_conn *bnx2i_conn;
u32 iscsi_cid;
- char warn_notice[] = "iscsi_warning";
- char error_notice[] = "iscsi_error";
- char additional_notice[64];
- char *message;
+ const char *additional_notice = "";
+ const char *message;
int need_recovery;
u64 err_mask64;
@@ -2224,133 +,132 @@ static void bnx2i_process_iscsi_error(struct
bnx2i_hba *hba,
if (err_mask64 & iscsi_error_mask) {
need_recovery = 0;
- message = warn_notice;
+ message = "iscsi_warning";
} else {
need_recovery = 1;
- message = error_notice;
+ message = "iscsi_error";
}
switch (iscsi_err->completion_status) {
case ISCSI_KCQE_COMPLETION_STATUS_HDR_DIG_ERR:
- strcpy(additional_notice, "hdr digest err");
+ additional_notice = "hdr digest err";
break;
case ISCSI_KCQE_COMPLETION_STATUS_DATA_DIG_ERR:
- strcpy(additional_notice, "data digest err");
+ additional_notice = "data digest err";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_OPCODE:
- strcpy(additional_notice, "wrong opcode rcvd");
+ additional_notice = "wrong opcode rcvd";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_AHS_LEN:
- strcpy(additional_notice, "AHS len > 0 rcvd");
+ additional_notice = "AHS len > 0 rcvd";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_ITT:
- strcpy(additional_notice, "invalid ITT rcvd");
+ additional_notice = "invalid ITT rcvd";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_STATSN:
- strcpy(additional_notice, "wrong StatSN rcvd");
+ additional_notice = "wrong StatSN rcvd";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_EXP_DATASN:
- strcpy(additional_notice, "wrong DataSN rcvd");
+ additional_notice = "wrong DataSN rcvd";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_PEND_R2T:
- strcpy(additional_notice, "pend R2T violation");
+ additional_notice = "pend R2T violation";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_O_U_0:
- strcpy(additional_notice, "ERL0, UO");
+ additional_notice = "ERL0, UO";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_O_U_1:
- strcpy(additional_notice, "ERL0, U1");
+ additional_notice = "ERL0, U1";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_O_U_2:
- strcpy(additional_notice, "ERL0, U2");
+ additional_notice = "ERL0, U2";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_O_U_3:
- strcpy(additional_notice, "ERL0, U3");
+ additional_notice = "ERL0, U3";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_O_U_4:
- strcpy(additional_notice, "ERL0, U4");
+ additional_notice = "ERL0, U4";
break;
case ISCSI_KCQE_COMPLETION_STATUS_PROTOCOL_ERR_O_U_5:
- strcpy(additional_notice, "ERL0, U5");
+ additional_notice = "ERL0, U5";
break;
case
