diff options
| author |   Colin Ian King <colin.king@canonical.com> | 2019-06-18 11:15:54 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-20 14:39:16 +0200 |
| commit | d326d99aa00f284e4320aededb3f7c663f5b4c87 (patch) | |
| tree | a93d31c5554d5d446876fc86507a360cf0322fa3 /drivers/staging/kpc2000 | |
| parent | staging: kpc2000: simplify error handling in kp2000_pcie_probe (diff) | |
| download | linux-dev-d326d99aa00f284e4320aededb3f7c663f5b4c87.tar.xz linux-dev-d326d99aa00f284e4320aededb3f7c663f5b4c87.zip | |
staging: kpc2000: fix integer overflow with left shifts
Currently there are several left shifts that are assigned to 64 bit
unsigned longs where a signed int 1 is being shifted, resulting in
an integer overflow. Fix this bit using the BIT_ULL macro to perform
a 64 bit shift. Also clean up an overly long statement.
Addresses-Coverity: ("Unintentional integer overflow")
Fixes: 7dc7967fc39a ("staging: kpc2000: add initial set of Daktronics drivers")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/kpc2000')
| -rw-r--r-- | drivers/staging/kpc2000/kpc2000/cell_probe.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/staging/kpc2000/kpc2000/cell_probe.c b/drivers/staging/kpc2000/kpc2000/cell_probe.c index 138d16bcf6e1..c124a836db27 100644 --- a/drivers/staging/kpc2000/kpc2000/cell_probe.c +++ b/drivers/staging/kpc2000/kpc2000/cell_probe.c @@ -238,7 +238,7 @@ int kp2000_check_uio_irq(struct kp2000_device *pcard, u32 irq_num) { u64 interrupt_active = readq(pcard->sysinfo_regs_base + REG_INTERRUPT_ACTIVE); u64 interrupt_mask_inv = ~readq(pcard->sysinfo_regs_base + REG_INTERRUPT_MASK); - u64 irq_check_mask = (1 << irq_num); + u64 irq_check_mask = BIT_ULL(irq_num); if (interrupt_active & irq_check_mask) { // if it's active (interrupt pending) if (interrupt_mask_inv & irq_check_mask) { // and if it's not masked off @@ -257,7 +257,9 @@ irqreturn_t kuio_handler(int irq, struct uio_info *uioinfo) return IRQ_NONE; if (kp2000_check_uio_irq(kudev->pcard, kudev->cte.irq_base_num)) { - writeq((1 << kudev->cte.irq_base_num), kudev->pcard->sysinfo_regs_base + REG_INTERRUPT_ACTIVE); // Clear the active flag + /* Clear the active flag */ + writeq(BIT_ULL(kudev->cte.irq_base_num), + kudev->pcard->sysinfo_regs_base + REG_INTERRUPT_ACTIVE); return IRQ_HANDLED; } return IRQ_NONE; @@ -273,9 +275,9 @@ int kuio_irqcontrol(struct uio_info *uioinfo, s32 irq_on) mutex_lock(&pcard->sem); mask = readq(pcard->sysinfo_regs_base + REG_INTERRUPT_MASK); if (irq_on) - mask &= ~(1 << (kudev->cte.irq_base_num)); + mask &= ~(BIT_ULL(kudev->cte.irq_base_num)); else - mask |= (1 << (kudev->cte.irq_base_num)); + mask |= BIT_ULL(kudev->cte.irq_base_num); writeq(mask, pcard->sysinfo_regs_base + REG_INTERRUPT_MASK); mutex_unlock(&pcard->sem); |