scsi: bnx2i: Make bnx2i_process_iscsi_error() simpler and more robust
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.
Link: https://lore.kernel.org/r/20210310221602.2494422-1-linux@rasmusvillemoes.dk
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
1 file changed