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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2021-12-20 16:32:50 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-12-21 11:18:44 +0300
commitd6d9d17abac8d337ecb052b47e918ca9c0b4ba1b (patch)
treebeed330b05aae4a2e16316b2f4f97b7f3f91b1f2 /drivers/usb
parente822b4973f49015e1c6f63b91c8641ed9bfaf229 (diff)
downloadlinux-d6d9d17abac8d337ecb052b47e918ca9c0b4ba1b.tar.xz
tty: tty_io: Switch to vmalloc() fallback in case of TTY_NO_WRITE_SPLIT
When TTY_NO_WRITE_SPLIT is set and 64 KiB chunks are used, allow vmalloc() fallback. Supply __GFP_RETRY_MAYFAIL to make kmalloc() preferable over vmalloc() since we may want a better performance. Note, both current users copy data to another buffer anyway, so the type of our allocation doesn't affect their expectations. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20211220133250.3070-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/class/cdc-acm.c4
1 files changed, 0 insertions, 4 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index b3ce7338cb6b..9b9aea24d58c 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -685,10 +685,6 @@ static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
if (retval)
goto error_get_interface;
- /*
- * FIXME: Why do we need this? Allocating 64K of physically contiguous
- * memory is really nasty...
- */
set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
acm->control->needs_remote_wakeup = 1;