[PATCH] pch_phub: return -ENODATA if ROM can't be mapped

From: Colin King
Date: Sat Feb 27 2016 - 09:52:29 EST

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

The error return err is not initialized for the case when pci_map_rom
fails and no ROM can me mapped. Fix this by setting ret to -ENODATA;
(this is the same error value that is returned if the ROM data is
successfully mapped but does not match the expected ROM signature.).

Issue found from static code analysis using CoverityScan.

Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
drivers/misc/pch_phub.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/pch_phub.c b/drivers/misc/pch_phub.c
index 15bb0c8..4810e03 100644
--- a/drivers/misc/pch_phub.c
+++ b/drivers/misc/pch_phub.c
@@ -513,8 +513,10 @@ static ssize_t pch_phub_bin_read(struct file *filp, struct kobject *kobj,

/* Get Rom signature */
chip->pch_phub_extrom_base_address = pci_map_rom(chip->pdev, &rom_size);
- if (!chip->pch_phub_extrom_base_address)
+ if (!chip->pch_phub_extrom_base_address) {
+ err = -ENODATA;
goto exrom_map_err;
+ }

pch_phub_read_serial_rom(chip, chip->pch_opt_rom_start_address,
(unsigned char *)&rom_signature);