xiaomi-sm8450/android_kernel_xiaomi_sm8450
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mei: revamp open handler counts

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Make open counter to be incremented and decremented
from mei_cl_link and mei_cl_unlik function respectively

Nfc was assuming symmetric linking API and thus open handler
count was never decreased. This patch fixes that.
We need to add separate open hander count for amthif which
is handled out of link/unlink functions and doesn't break
the symmetric API.

Last we do not waste clients slots if amthif or wd are not present
in the device. we don't need to allocates slots ahead
it is all covered by link/unlink before the devices is responding
to user space connection and thus not racing on allocation

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler
2013-09-16 23:44:47 +03:00
committed by Greg Kroah-Hartman
parent e036cc5727
commit 22f96a0eb6
5 changed files with 20 additions and 16 deletions
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5
drivers/misc/mei/init.c
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@@ -165,12 +165,7 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
/* remove entry if already in list */
dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n");
mei_cl_unlink(&dev->wd_cl);
if (dev->open_handle_count > 0)
dev->open_handle_count--;
mei_cl_unlink(&dev->iamthif_cl);
if (dev->open_handle_count > 0)
dev->open_handle_count--;
mei_amthif_reset_params(dev);
memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg));
}