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* misc: ibmvsm: Fix potential NULL pointer dereferenceGustavo A. R. Silva2019-01-181-2/+5
| | | | | | | | | | | | | | | | | There is a potential NULL pointer dereference in case kzalloc() fails and returns NULL. Fix this by adding a NULL check on *session* Also, update the function header with information about the expected return on failure and remove unnecessary variable rc. This issue was detected with the help of Coccinelle. Fixes: 0eca353e7ae7 ("misc: IBM Virtual Management Channel Driver (VMC)") Cc: stable@vger.kernel.org Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: ibmvsm: Fix wrong assignment of return codeBryant G. Ly2018-09-121-1/+1
| | | | | | | | | | Currently the assignment is flipped and rc is always 0. Signed-off-by: Bryant G. Ly <bryantly@linux.ibm.com> Fixes: 0eca353e7ae7 ("misc: IBM Virtual Management Channel Driver (VMC)") Reviewed-by: Bradley Warrum <bwarrum@us.ibm.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: ibmvmc: Use GFP_ATOMIC under spin lockWei Yongjun2018-07-071-1/+1
| | | | | | | | | | | The function alloc_dma_buffer() is called from ibmvmc_add_buffer(), in which a spin lock be held here, so we should use GFP_ATOMIC when a lock is held. Fixes: 0eca353e7ae7 ("misc: IBM Virtual Management Channel Driver (VMC)") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Reviewed-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* misc: IBM Virtual Management Channel Driver (VMC)Bryant G. Ly2018-05-141-0/+2418
This driver is a logical device which provides an interface between the hypervisor and a management partition. This interface is like a message passing interface. This management partition is intended to provide an alternative to HMC-based system management. VMC enables the Management LPAR to provide basic logical partition functions: - Logical Partition Configuration - Boot, start, and stop actions for individual partitions - Display of partition status - Management of virtual Ethernet - Management of virtual Storage - Basic system management This driver is to be used for the POWER Virtual Management Channel Virtual Adapter on the PowerPC platform. It provides a character device which allows for both request/response and async message support through the /dev/ibmvmc node. Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com> Reviewed-by: Steven Royer <seroyer@linux.vnet.ibm.com> Reviewed-by: Adam Reznechek <adreznec@linux.vnet.ibm.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Tested-by: Taylor Jakobson <tjakobs@us.ibm.com> Tested-by: Brad Warrum <bwarrum@us.ibm.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>