static void kfree_sgl()

in fusion/mptctl.c [130:191]

• 25 lines of code
• 4 McCabe index (conditional complexity)

static void kfree_sgl(MptSge_t *sgl, dma_addr_t sgl_dma,
		struct buflist *buflist, MPT_ADAPTER *ioc);

/*
 * Reset Handler cleanup function
 */
static int  mptctl_ioc_reset(MPT_ADAPTER *ioc, int reset_phase);

/*
 * Event Handler function
 */
static int mptctl_event_process(MPT_ADAPTER *ioc, EventNotificationReply_t *pEvReply);
static struct fasync_struct *async_queue=NULL;

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
 * Scatter gather list (SGL) sizes and limits...
 */
//#define MAX_SCSI_FRAGS	9
#define MAX_FRAGS_SPILL1	9
#define MAX_FRAGS_SPILL2	15
#define FRAGS_PER_BUCKET	(MAX_FRAGS_SPILL2 + 1)

//#define MAX_CHAIN_FRAGS	64
//#define MAX_CHAIN_FRAGS	(15+15+15+16)
#define MAX_CHAIN_FRAGS		(4 * MAX_FRAGS_SPILL2 + 1)

//  Define max sg LIST bytes ( == (#frags + #chains) * 8 bytes each)
//  Works out to: 592d bytes!     (9+1)*8 + 4*(15+1)*8
//                  ^----------------- 80 + 512
#define MAX_SGL_BYTES		((MAX_FRAGS_SPILL1 + 1 + (4 * FRAGS_PER_BUCKET)) * 8)

/* linux only seems to ever give 128kB MAX contiguous (GFP_USER) mem bytes */
#define MAX_KMALLOC_SZ		(128*1024)

#define MPT_IOCTL_DEFAULT_TIMEOUT 10	/* Default timeout value (seconds) */

/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/**
 *	mptctl_syscall_down - Down the MPT adapter syscall semaphore.
 *	@ioc: Pointer to MPT adapter
 *	@nonblock: boolean, non-zero if O_NONBLOCK is set
 *
 *	All of the ioctl commands can potentially sleep, which is illegal
 *	with a spinlock held, thus we perform mutual exclusion here.
 *
 *	Returns negative errno on error, or zero for success.
 */
static inline int
mptctl_syscall_down(MPT_ADAPTER *ioc, int nonblock)
{
	int rc = 0;

	if (nonblock) {
		if (!mutex_trylock(&ioc->ioctl_cmds.mutex))
			rc = -EAGAIN;
	} else {
		if (mutex_lock_interruptible(&ioc->ioctl_cmds.mutex))
			rc = -ERESTARTSYS;
	}
	return rc;
}