diff options
| author | Felix Held <felix-coreboot@felixheld.de> | 2021-12-10 18:38:16 +0100 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-12-15 22:39:07 +0000 |
| commit | e3ae755575e0646f9dd47400a1dfc6018e16e9a8 (patch) | |
| tree | b02655b6722c8361e771a3989f812ec26742e222 /src/drivers/spi/spi-generic.c | |
| parent | 856d6bc6d3d7c19be0e17c6fc6ad089868bf4b54 (diff) | |
drivers/spi/spi-generic: fix edge case in spi_crop_chunk
In the case of deduct_cmd_len being set and the adjusted cmd_len >=
ctrlr_max, ctrlr_max wasn't being adjusted and still had the value of
ctrlr->max_xfer_size. Handle this edge case (which we should never run
into) by setting ctrlr_max to 0 and printing a warning to the console.
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I9941b2947bb0a44dfae8ee69f509795dfb0cb241
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60121
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Diffstat (limited to 'src/drivers/spi/spi-generic.c')
| -rw-r--r-- | src/drivers/spi/spi-generic.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/src/drivers/spi/spi-generic.c b/src/drivers/spi/spi-generic.c index 116daf9088..9796663da2 100644 --- a/src/drivers/spi/spi-generic.c +++ b/src/drivers/spi/spi-generic.c @@ -98,8 +98,14 @@ unsigned int spi_crop_chunk(const struct spi_slave *slave, unsigned int cmd_len, if (deduct_opcode_len) cmd_len--; - if (deduct_cmd_len && (ctrlr_max > cmd_len)) - ctrlr_max -= cmd_len; + if (deduct_cmd_len) { + if (ctrlr_max >= cmd_len) { + ctrlr_max -= cmd_len; + } else { + ctrlr_max = 0; + printk(BIOS_WARNING, "%s: Command longer than buffer\n", __func__); + } + } return MIN(ctrlr_max, buf_len); } |