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| author | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-03-25 21:20:47 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-03-25 23:02:27 +0100 |
| commit | 4f777d011bdd9e78fcf02701e89c8be457504a6c (patch) | |
| tree | 742a78d07fb8297d8bf88c6e61717080adab75d7 | |
| parent | media: cx2341x: replace badly designed macros (diff) | |
| download | linux-4f777d011bdd9e78fcf02701e89c8be457504a6c.tar.xz linux-4f777d011bdd9e78fcf02701e89c8be457504a6c.zip | |
media: pwc-ctl: pChoose can't be NULL
The way the code works, compression will be a valid value (less or equal to 3)
on both set_video_mode_foo() calls at the beginning of the while() loop.
So, the value for pChoose can't be NULL.
Solves those smatch warnings:
drivers/media/usb/pwc/pwc-ctrl.c: drivers/media/usb/pwc/pwc-ctrl.c:252 set_video_mode_Timon() warn: variable dereferenced before check 'pChoose' (see line 248)
drivers/media/usb/pwc/pwc-ctrl.c: drivers/media/usb/pwc/pwc-ctrl.c:302 set_video_mode_Kiara() warn: variable dereferenced before check 'pChoose' (see line 298)
and simplifies the code a little bit.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
| -rw-r--r-- | drivers/media/usb/pwc/pwc-ctrl.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/media/usb/pwc/pwc-ctrl.c b/drivers/media/usb/pwc/pwc-ctrl.c index 655cef39eb3d..b681a184ef87 100644 --- a/drivers/media/usb/pwc/pwc-ctrl.c +++ b/drivers/media/usb/pwc/pwc-ctrl.c @@ -242,14 +242,14 @@ static int set_video_mode_Timon(struct pwc_device *pdev, int size, int pixfmt, fps = (frames / 5) - 1; /* Find a supported framerate with progressively higher compression */ - pChoose = NULL; - while (*compression <= 3) { + do { pChoose = &Timon_table[size][fps][*compression]; if (pChoose->alternate != 0) break; (*compression)++; - } - if (pChoose == NULL || pChoose->alternate == 0) + } while (*compression <= 3); + + if (pChoose->alternate == 0) return -ENOENT; /* Not supported. */ if (send_to_cam) @@ -279,7 +279,7 @@ static int set_video_mode_Timon(struct pwc_device *pdev, int size, int pixfmt, static int set_video_mode_Kiara(struct pwc_device *pdev, int size, int pixfmt, int frames, int *compression, int send_to_cam) { - const struct Kiara_table_entry *pChoose = NULL; + const struct Kiara_table_entry *pChoose; int fps, ret = 0; if (size >= PSZ_MAX || *compression < 0 || *compression > 3) @@ -293,13 +293,14 @@ static int set_video_mode_Kiara(struct pwc_device *pdev, int size, int pixfmt, fps = (frames / 5) - 1; /* Find a supported framerate with progressively higher compression */ - while (*compression <= 3) { + do { pChoose = &Kiara_table[size][fps][*compression]; if (pChoose->alternate != 0) break; (*compression)++; - } - if (pChoose == NULL || pChoose->alternate == 0) + } while (*compression <= 3); + + if (pChoose->alternate == 0) return -ENOENT; /* Not supported. */ /* Firmware bug: video endpoint is 5, but commands are sent to endpoint 4 */ |