On 01/08/2019 13:09, Christophe JAILLET wrote: > 'xive_irq_bitmap_add()' can return -ENOMEM. > In this case, we should free the memory already allocated and return > 'false' to the caller. > > Also add an error path which undoes the 'tima = ioremap(...)' > > Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx> > --- > NOT compile tested (I don't have a cross compiler and won't install one). All distros have a packaged powerpc cross compiler. Then, you need to compile a kernel for a pseries machine and run a pseries machine with it under QEMU. You can use a simple ppc initrd, a net install one for example. You could also hack the device tree in QEMU to torture the XIVE sPAPR driver. Nothing too complex, all is here : https://git.qemu.org/?p=qemu.git;a=blob;f=hw/intc/spapr_xive.c;h=097f88d4608d8ba160526756a3a224e5176b6e0f;hb=HEAD#l1427 > So if some correction or improvement are needed, feel free to propose and > commit it directly. Yes there is I think. I would move at the end all the code that needs a rollback. Thanks for taking a look, I might do that one day. Cheers, C. > --- > arch/powerpc/sysdev/xive/spapr.c | 36 +++++++++++++++++++++++++------- > 1 file changed, 28 insertions(+), 8 deletions(-) > > diff --git a/arch/powerpc/sysdev/xive/spapr.c b/arch/powerpc/sysdev/xive/spapr.c > index 52198131c75e..b3ae0b76c433 100644 > --- a/arch/powerpc/sysdev/xive/spapr.c > +++ b/arch/powerpc/sysdev/xive/spapr.c > @@ -64,6 +64,17 @@ static int xive_irq_bitmap_add(int base, int count) > return 0; > } > > +static void xive_irq_bitmap_remove_all(void) > +{ > + struct xive_irq_bitmap *xibm, *tmp; > + > + list_for_each_entry_safe(xibm, tmp, &xive_irq_bitmaps, list) { > + list_del(&xibm->list); > + kfree(xibm->bitmap); > + kfree(xibm); > + } > +} > + > static int __xive_irq_bitmap_alloc(struct xive_irq_bitmap *xibm) > { > int irq; > @@ -723,7 +734,7 @@ bool __init xive_spapr_init(void) > u32 val; > u32 len; > const __be32 *reg; > - int i; > + int i, err; > > if (xive_spapr_disabled()) > return false; > @@ -748,23 +759,26 @@ bool __init xive_spapr_init(void) > } > > if (!xive_get_max_prio(&max_prio)) > - return false; > + goto err_unmap; > > /* Feed the IRQ number allocator with the ranges given in the DT */ > reg = of_get_property(np, "ibm,xive-lisn-ranges", &len); > if (!reg) { > pr_err("Failed to read 'ibm,xive-lisn-ranges' property\n"); > - return false; > + goto err_unmap; > } > > if (len % (2 * sizeof(u32)) != 0) { > pr_err("invalid 'ibm,xive-lisn-ranges' property\n"); > - return false; > + goto err_unmap; > } > > - for (i = 0; i < len / (2 * sizeof(u32)); i++, reg += 2) > - xive_irq_bitmap_add(be32_to_cpu(reg[0]), > - be32_to_cpu(reg[1])); > + for (i = 0; i < len / (2 * sizeof(u32)); i++, reg += 2) { > + err = xive_irq_bitmap_add(be32_to_cpu(reg[0]), > + be32_to_cpu(reg[1])); > + if (err < 0) > + goto err_mem_free; > + } > > /* Iterate the EQ sizes and pick one */ > of_property_for_each_u32(np, "ibm,xive-eq-sizes", prop, reg, val) { > @@ -775,8 +789,14 @@ bool __init xive_spapr_init(void) > > /* Initialize XIVE core with our backend */ > if (!xive_core_init(&xive_spapr_ops, tima, TM_QW1_OS, max_prio)) > - return false; > + goto err_mem_free; > > pr_info("Using %dkB queues\n", 1 << (xive_queue_shift - 10)); > return true; > + > +err_mem_free: > + xive_irq_bitmap_remove_all(); > +err_unmap: > + iounmap(tima); > + return false; > } >
