kernel/drivers/misc/mic/host/mic_virtio.c, branch linux-4.1.y

misc: mic: add dma support in host driver

2014-07-12T01:31:12Z

This patch adds a dma device on the mic virtual bus and uses this dmaengine to transfer data for virtio devices Reviewed-by: Nikhil Rao Signed-off-by: Sudeep Dutt Signed-off-by: Ashutosh Dixit Signed-off-by: Siva Yerramreddy Signed-off-by: Greg Kroah-Hartman

misc: mic: add threaded irq support in host driver

2014-07-12T01:29:55Z

Convert mic_request_irq to mic_request_threaded_irq to support threaded irq for virtual devices on mic bus. Reviewed-by: Ashutosh Dixit Reviewed-by: Nikhil Rao Reviewed-by: Sudeep Dutt Signed-off-by: Siva Yerramreddy Signed-off-by: Greg Kroah-Hartman

misc: mic: fix possible signed underflow (undefined behavior) in userspace API

2014-02-07T23:30:34Z

iovcnt is declared as a signed integer in both the userspace API and as a local variable in mic_virtio.c. The while() loop in mic_virtio.c iterates until the local variable iovcnt reaches the value 0. If userspace passes e.g. INT_MIN as iovcnt field, this loop then appears to depend on an undefined behavior (signed underflow) to complete. The fix is to use unsigned integers in both the userspace API and the local variable. This issue was reported @ https://lkml.org/lkml/2014/1/10/10 Reported-by: Mathieu Desnoyers Reviewed-by: Ashutosh Dixit Signed-off-by: Sudeep Dutt Cc: stable Signed-off-by: Greg Kroah-Hartman

Merge 3.13-rc4 into char-misc-next

2013-12-17T00:11:28Z

We want these fixes in here.

misc: mic: bug fix for interrupt acknowledgement in MSI/INTx case.

2013-12-11T07:05:52Z

The interrupt handler (mic_interrupt), called in the MSI/INTx mode, writes to the interrupt sources register to acknowledge the interrupt and then calls the corresponding callback handlers to handle the same. These callback handlers acknowledge the interrupts again leading to missed interrupts. This patch fixes the issue by removing the interrupt acknowlegment code from the callback handlers. Reviewed-by: Sudeep Dutt Reviewed-by: Nikhil Rao Reviewed-by: Siva Krishna Kumar Reddy Yerramreddy Signed-off-by: Dasaratharaman Chandramouli Cc: stable # 3.13 Signed-off-by: Greg Kroah-Hartman

misc: mic: Suppress memory space sparse warnings

2013-11-27T19:08:30Z

MIC card and host drivers are able to use virtio over the PCIe bus by treating ioremap return values for the prefetchable BARs as pointers, effectively treating I/O memory the same as system memory. However this results in sparse warnings. Knowing that these warnings do not point to a functional issue, this patch suppresses these warnings. Reported-by: Fengguang Wu Reviewed-by: Sudeep Dutt Signed-off-by: Nikhil Rao Signed-off-by: Ashutosh Dixit Signed-off-by: Greg Kroah-Hartman

misc: mic: Fix endianness issues.

2013-11-27T19:03:38Z

Endianness issues are now consistent as per the documentation in host/mic_virtio.h. Sparse warnings related to endianness are also fixed. Note that the MIC driver implementation assumes that the host can be both BE or LE whereas the card is always LE. Reported-by: Fengguang Wu Reviewed-by: Sudeep Dutt Reviewed-by: Nikhil Rao Signed-off-by: Ashutosh Dixit Signed-off-by: Greg Kroah-Hartman

misc: mic: Fix user space namespace pollution from mic_common.h.

2013-11-27T19:03:38Z

Avoid declaring ALIGN() and __aligned() in include/uapi/linux/mic_common.h since they pollute user space namespace. Also, mic_aligned_size() can be simply replaced simply by sizeof() since all structures where mic_aligned_size() is used are declared using __attribute__ ((aligned(8))); -- >From mail from H Peter Anvin about this: On Fri, Nov 08, 2013 H Peter Anvin wrote: Subject: Namespace pollution in mic_common.h This puts two macros, ALIGN() and __aligned(), into arbitrary user space namespace. This really isn't safe or acceptable, especially since those symbols are highly generic. ... When these structures are forced-aligned, they will in fact have padding automatically added by the compiler to an 8-byte boundary anyway, so mic_aligned_size() does nothing. ... Reported-by: H Peter Anvin Reviewed-by: Sudeep Dutt Signed-off-by: Nikhil Rao Signed-off-by: Ashutosh Dixit Signed-off-by: Greg Kroah-Hartman

misc: mic: Minor bug fix in 'retry' loops.

2013-11-27T19:03:38Z

The bug would result in incorrect 'retry' value being printed in debug statements as well as dead code in mic_find_vqs(...) in drivers/misc/mic/card/mic_virtio.c. Reported-by: Michael Opdenacker Reviewed-by: Ashutosh Dixit Signed-off-by: Sudeep Dutt Signed-off-by: Greg Kroah-Hartman

misc: mic: Fixes for randconfig build errors and warnings.

2013-10-30T17:19:30Z

This patch fixes the build errors and warnings reported at https://lkml.org/lkml/2013/10/29/421. Co-author: Dasaratharaman Chandramouli Reviewed-by: Sudeep Dutt Reported-by: Jim Davis Signed-off-by: Ashutosh Dixit Signed-off-by: Greg Kroah-Hartman