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usb: remove a stale comment in hcd_alloc_coherent

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Now that we have the local memory pool implemented there is no
need to use dma_declare_coherent_memory.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20190903084615.19161-5-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig 2019-09-03 10:46:13 +02:00 committed by Greg Kroah-Hartman
parent bf89015a54
commit ac2658e0d9
1 changed files with 0 additions and 3 deletions
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drivers/usb/core/hcd.c
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@ -1249,9 +1249,6 @@ EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
* To support host controllers with limited dma capabilities we provide dma
* bounce buffers. This feature can be enabled by initializing
* hcd->localmem_pool using usb_hcd_setup_local_mem().
* For this to work properly the host controller code must first use the
* function dma_declare_coherent_memory() to point out which memory area
* that should be used for dma allocations.
*
* The initialized hcd->localmem_pool then tells the usb code to allocate all
* data for dma using the genalloc API.