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| author | Matthijs Kooijman <matthijs@stdin.nl> | 2013-08-30 16:45:12 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-30 21:14:51 (GMT) |
| commit | 3b9edf88472e9259f9361aa485a1f399e54c4c77 (patch) | |
| tree | 6135c53b044f77e975ad1e8773c15aebdfa3cc89 | |
| parent | 4ab799df6d71694ce091780af31484d6a63c2939 (diff) | |
| download | linux-fsl-qoriq-3b9edf88472e9259f9361aa485a1f399e54c4c77.tar.xz | |
staging: dwc2: fix off-by-one in check for max_packet_count parameter
Previously, the max_packet_count could be set to 1 << x, where x is the
number of bits available (width + 4 in the code). Since 1 << x requires
x + 1 bits to represent, this will not work. The real maximum value is
(1 << x) - 1. This value is already used the default when the set value
is invalid, but the upper limit for the set value was off-by-one.
This change makes the check the same as the one for max_transfer_size,
which was already correct.
Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/dwc2/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/staging/dwc2/core.c b/drivers/staging/dwc2/core.c index a090f79..5f09f47 100644 --- a/drivers/staging/dwc2/core.c +++ b/drivers/staging/dwc2/core.c @@ -2209,7 +2209,7 @@ int dwc2_set_param_max_packet_count(struct dwc2_hsotg *hsotg, int val) GHWCFG3_PACKET_SIZE_CNTR_WIDTH_MASK >> GHWCFG3_PACKET_SIZE_CNTR_WIDTH_SHIFT; - if (val < 15 || val > (1 << (width + 4))) + if (val < 15 || val >= (1 << (width + 4))) valid = 0; if (!valid) { |