USB: xhci: Allow allocation of commands without input contexts.
The xhci_command structure is the basic structure for issuing commands to
the xHCI hardware. It contains a struct completion (so that the issuing
function can wait on the command), command status, and a input context
that is used to pass information to the hardware. Not all commands need
the input context, so make it optional to allocate. Allow
xhci_free_container_ctx() to be passed a NULL input context, to make
freeing the xhci_command structure simple.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 1f1f8a0..8045bc6 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -267,6 +267,8 @@
void xhci_free_container_ctx(struct xhci_hcd *xhci,
struct xhci_container_ctx *ctx)
{
+ if (!ctx)
+ return;
dma_pool_free(xhci->device_pool, ctx->bytes, ctx->dma);
kfree(ctx);
}
@@ -844,7 +846,8 @@
}
struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci,
- bool allocate_completion, gfp_t mem_flags)
+ bool allocate_in_ctx, bool allocate_completion,
+ gfp_t mem_flags)
{
struct xhci_command *command;
@@ -852,11 +855,14 @@
if (!command)
return NULL;
- command->in_ctx =
- xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_INPUT, mem_flags);
- if (!command->in_ctx) {
- kfree(command);
- return NULL;
+ if (allocate_in_ctx) {
+ command->in_ctx =
+ xhci_alloc_container_ctx(xhci, XHCI_CTX_TYPE_INPUT,
+ mem_flags);
+ if (!command->in_ctx) {
+ kfree(command);
+ return NULL;
+ }
}
if (allocate_completion) {