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authorFelipe Balbi <balbi@ti.com>2015-09-15 09:39:45 -0500
committerFelipe Balbi <balbi@ti.com>2015-09-27 10:54:31 -0500
commit2e6c72b61b9a0a7787e8cfa3fff3b34a0c2548ce (patch)
tree46ba0a0afffa7a19715e4593563fed289252832c /drivers/usb/gadget
parenta8f32817eeb0ada6367d812de5cd2ee91a532a48 (diff)
downloadop-kernel-dev-2e6c72b61b9a0a7787e8cfa3fff3b34a0c2548ce.zip
op-kernel-dev-2e6c72b61b9a0a7787e8cfa3fff3b34a0c2548ce.tar.gz
usb: gadget: mass_storage: allow for deeper queue lengths
Instead of allowing a range of 2 to 4 requests, let's allow the user choose up to 32 requests as that will give us a better chance of keeping controller busy. We still maintain default of 2 so users shouldn't be affected. Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/gadget')
-rw-r--r--drivers/usb/gadget/Kconfig2
-rw-r--r--drivers/usb/gadget/function/f_mass_storage.c6
2 files changed, 5 insertions, 3 deletions
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index bcf83c0..33834aa 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -113,7 +113,7 @@ config USB_GADGET_VBUS_DRAW
config USB_GADGET_STORAGE_NUM_BUFFERS
int "Number of storage pipeline buffers"
- range 2 4
+ range 2 32
default 2
help
Usually 2 buffers are enough to establish a good buffering
diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c
index a6eb537..5277e7c 100644
--- a/drivers/usb/gadget/function/f_mass_storage.c
+++ b/drivers/usb/gadget/function/f_mass_storage.c
@@ -2662,10 +2662,12 @@ EXPORT_SYMBOL_GPL(fsg_common_put);
/* check if fsg_num_buffers is within a valid range */
static inline int fsg_num_buffers_validate(unsigned int fsg_num_buffers)
{
- if (fsg_num_buffers >= 2 && fsg_num_buffers <= 4)
+#define FSG_MAX_NUM_BUFFERS 32
+
+ if (fsg_num_buffers >= 2 && fsg_num_buffers <= FSG_MAX_NUM_BUFFERS)
return 0;
pr_err("fsg_num_buffers %u is out of range (%d to %d)\n",
- fsg_num_buffers, 2, 4);
+ fsg_num_buffers, 2, FSG_MAX_NUM_BUFFERS);
return -EINVAL;
}
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